We bade adieu to Mr Nash, with a deep sense of his heroic philanthropy, and of the value of the lesson which he is giving as to the means of reclaiming the desert places of society.  As far as the funds supplied to him permit, he is transforming the juvenile delinquents of the London streets into respectable citizens, having already redeemed a hundred and fifty-six, and either provided for them in England, or despatched them to the colonies.  One may well suppose, that in the process of reformation much must depend upon the special character of the person who exercises the reforming discipline.  A mere routine of school exercises, of scripture readings, of hymn singings, would go little way with minds so vitiated by bad habits, if there were not a particular effort made by the disciplinarian to make all work thoroughly into the moral nature of the pupils, so as to produce a real renewal of feeling and spirit.  Even to rouse the unfortunate being from the idea with which he is apt to start, that he is only called upon to enter on a new career which will be better for him in a worldly point of view, and to elevate him to the superior and only vitally serviceable idea, that he must love goodness for its own sake, and for the love of the Author of all goodness, is no light task.  We can, therefore, imagine scarcely any position calling for a more peculiar combination of qualities than that of the conductor of this extraordinary seminary.  It is a strong testimony to the suitableness of Mr Nash for his functions, that they were entered upon under the impulse of his own mind.  We have further proof of it in the good effects of his teaching, for the histories of many young men who have passed through his hands can be traced from authentic documents.  One who emigrated to the United States so lately as March 1850, already reports that he is earning there L.3, 12s. per week, and has just married a young woman who had saved 300 dollars; another of his pupils is now acting as a missionary in Australia.  They write to their former governor in the most grateful terms, and with strong expressions of hope regarding their own future.  It is interesting to think of all this good being done by individual exertion and self-devotion.  No government interferes:  there is no certain fund to be depended on.  A simple MAN, sensible of humane obligations towards the unfortunate, comes forward and puts himself in direct intercourse with them.  They might mistake the views of a government, or of a set of parish authorities; they might lean unduly upon any formally-appointed fund.  They cannot mistake the designs of a mere human being like themselves, or become spoiled by indulgence in so poor a retreat.  The gratitude due by society to such a man is incalculable.